CN109898176A - A kind of flexible extensible hydrogel fiber optic sensor and its preparation and application - Google Patents
A kind of flexible extensible hydrogel fiber optic sensor and its preparation and application Download PDFInfo
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Abstract
The present invention relates to a kind of flexible extensible hydrogel fiber optic sensor and its preparation and application, the optical fiber is skin-core structure, and wherein cortex is transparent silica gel capillary；Sandwich layer is the polyacrylamide hydrogel containing lithium bromide.Acrylamide is dissolved in inject in silicone tube after lithium bromide water solution and is polymerize, acquired hydrogel optical fiber can respond extraneous environmental stimulus.Hydrogel fiber optic sensor prepared by the present invention has the features such as sensitive preparation simple, flexible extensible, pressure sensitive, stable signal transmission, thus has the potentiality and wide commercial application prospect of large scale preparation.
Description
Technical field
The invention belongs to optical fiber and its preparation and application field, in particular to a kind of flexible extensible hydrogel light guide
Fiber sensor and its preparation and application.
Background technique
Nowadays, the sensor based on electrical signal detection is by detecting environmental stimuli such as human motion, environment temperature mostly
The data of electric current, resistance or capacitance variations caused by degree change etc..But there is very big disadvantage in this sensor, such as in use process
In, electrical signal detected by sensor is easy by electromagnetic interference, to cause the loss or entanglement of signal.And it is based on light
The sensor for learning signal production has light weight, not by electromagnetic interference, sensitivity height etc. compared to traditional electronic sensor
Advantage.Fiber bragg grating (Fiber Bragg Grating, FBG) that traditional fibre optical sensor such as has been commercialized and
The optical fiber material of " Lab-on-Fiber " technology is still based on traditional hard transparent glass or plastics (such as polystyrene, poly- methyl
Methyl acrylate, polycarbonate etc.), deformation quantity is less than 1% and poor biocompatibility, it is difficult to match wearable field to flexible and
The requirement of draftability (such as articulations digitorum manus deformation quantity is at least more than 30%).With the hydrogel to match with human skin modulus due to
High-moisture percentage, the properties such as mechanical property, the transparency, refractive index are adjustable extensively, easily designed and excellent flexible of material structure
Property and biocompatibility become optical fiber material ideal chose.For example, " biotechnology and bioengineering "
(Biotechnol.Bioeng.2009,103,725) gel core and fine jade with biocompatibility and biological degradability are reported
The light of lipolysaccharide covering conducts, and wherein the introducing of covering effectively improves light transmissioning efficiency." biomedical optical flash report "
(Biomed.Opt.Express 2015,6,4221) report, fibroin albumen are used as fibre core to be encapsulated in hydrogel after treatment
In, biocompatible hydrogels optic delivery can be linked together with conventional optical systems by glass optical fiber coupling." advanced material
Material " (Adv.Mater.2015,27,4081) report, cross-linked polyethylene glycol diacrylate is prepared into hydrogel optical fiber,
It can be used for biological information optical detection in Mice Body." advanced material " (Adv.Mater.2016,28,10244) report, by difference
Step type optical fiber made of calcium alginate-polyacrylamide hydrogel of solid content can assign the stretchable of the fiber height
Property and excellent light conductive performance.
Although above-mentioned hydrogel optical fiber solves the problems, such as that optical sensor flexibility and light are conductive, water-setting
Easily dehydration causes signal to transmit unstable, the use being highly detrimental under vitro in air for glue exposure.
Summary of the invention
Technical problem to be solved by the invention is to provide a kind of flexible extensible hydrogel fiber optic sensor and its
Preparation and application overcome hydrogel light guide easily dehydration in the prior art to cause signal transmission unstable, are unfavorable for vitro
The lower technological deficiency used.The present invention selects suitable cortical material, and adjusts fibre core hydrogel refractive index to meet flexible light
The requirement of fiber sensor is cortex using the transparent flexible silica gel capillary of low-refraction, and into polyacrylamide hydrogel
The salt (lithium bromide) of high refractive index is introduced to increase core refractive rate.
A kind of hydrogel optical fiber of the invention, the optical fiber are skin-core structure, and wherein cortex is transparent silica gel
Capillary；
Sandwich layer is the polyacrylamide hydrogel containing lithium bromide.
A kind of preparation method of hydrogel optical fiber of the invention, comprising:
(1) lithium bromide water solution is mixed with acrylamide monomer, obtains mixed solution；
(2) photoinitiator, crosslinking agent are added in mixed solution, is then injected into transparent silica gel capillary, ultraviolet light solidification,
Up to hydrogel optical fiber.
The mass percentage concentration of lithium bromide water solution is 50wt%-60wt% in the step (1)；Propylene in mixed solution
The mass percentage concentration of amide monomer is 30-40wt%.
Mixed solution in the step (1) specifically: acrylamide monomer is added in lithium bromide water solution, and oscillation dissolution is right
Ultrasound removes bubble afterwards.
The preparation of the lithium bromide water solution specifically: move into load weighted anhydrous lithium bromide in deionized water, oscillation
Then ultrasound removes bubble for dissolution.
Photoinitiator is 2,2'- azo-bis-isobutyrate hydrochloride in the step (2)；Crosslinking agent is N, N'- di-2-ethylhexylphosphine oxide
Acrylamide.The mass ratio (0.0014-0.0016) of photoinitiator, crosslinking agent and acrylamide monomer in the step (2):
(0.0035-0.0045):1.In the step (2) in mixed solution be added photoinitiator, crosslinking agent then vibrates, ultrasound makes
All of which dissolution.
In the step (2) outer diameter of transparent silica gel capillary be 1.5mm, internal diameter 1.0mm, i.e., (outer diameter * internal diameter) be
1.5mm*1.0mm。
Solution is injected in transparent silica gel capillary using injection needle in the step (2).
UV light turns in the step (2): the wavelength of ultraviolet light is 365nm and light application time was at 2-3 minutes.
The present invention provides a kind of application of hydrogel optical fiber, such as the application as pressure sensor.
Beneficial effect
(1) suitable elastomer cortex is used in the present invention, while the refractive index of fibre core and cortex is effectively adjusted
To meet the characteristic of light conduction (cortex refractive index is less than sandwich layer)；
(2) operation of the present invention process is simple, short preparation period, and lower production costs are easy to mass production；
(3) compared to it is commercialized quartz or polymer optical fibers, the present invention obtained by silica gel capillary/polypropylene
Amide hydrogel optical fiber has many characteristics, such as that flexible extensible, pressure sensing response, optical transmission signal are stablized.
Detailed description of the invention
Fig. 1 is the variations in refractive index figure of the lithium bromide water solution of different quality containing；
Fig. 2 is the polyacrylamide hydrogel (35wt% third prepared by the lithium bromide water solution of 60wt% containing lithium bromide
Acrylamide solution is light-initiated to be obtained) the variation comparison diagram of refractive index and virgin pp amide hydrogel refractive index；
Fig. 3 is light in silica gel capillary/polyacrylamide hydrogel optical fiber containing lithium bromide of transparent embodiment 5
Propagation distance variation caused by optical power change figure；
Fig. 4 is the polyacrylamide hydrogel optical fiber soft stretch curve graph containing lithium bromide of embodiment 5；
Fig. 5 is light in transparent silica gel capillary/polyacrylamide hydrogel optical fiber containing lithium bromide of embodiment 5
Lightray propagation stablize figure；
Fig. 6 is transparent silica gel capillary/polyacrylamide hydrogel optical fiber containing lithium bromide of embodiment 5 by outer
The stimuli responsive of boundary's applied force and the corresponding diagram of signal attenuation change.
Specific embodiment
Present invention will be further explained below with reference to specific examples.It should be understood that these embodiments are merely to illustrate the present invention
Rather than it limits the scope of the invention.In addition, it should also be understood that, after reading the content taught by the present invention, those skilled in the art
Member can make various changes or modifications the present invention, and such equivalent forms equally fall within the application the appended claims and limited
Range.
Lithium bromide is purchased from Tai Tan scientific & technical corporation, article No. 01112263；Acrylamide (is purchased from Sigma Corporation, article No. is
V900845；2,2'- azo-bis-isobutyrate hydrochloride (is purchased from Sigma Corporation, article No. 440914)；N, N'- di-2-ethylhexylphosphine oxide third
Acrylamide (is purchased from Sigma Corporation, article No. 146072)；Transparent silica gel capillary (is purchased from Shanghai Shen Hui product of rubber and plastic factory, silicon
For the use temperature of glue capillary at -60 DEG C~220 DEG C, hardness is about 65 degree).
The preparation of lithium bromide water solution in embodiment:
Load weighted anhydrous lithium bromide is moved into deionized water, then ultrasound removes bubble for oscillation dissolution.Such as Fig. 1 institute
Show, with the increase of lithium bromide concentration, the aqueous solution refractive index of lithium bromide is also with improve.Wherein the measurement of refractive index uses
It is that Japan's love opens up ATAGO PAL-RI digital display refractometer.
The preparation of acrylamide aqueous solution containing lithium bromide:
Load weighted acrylamide monomer is moved into lithium bromide water solution, then ultrasound removes bubble for oscillation dissolution.Such as
Shown in Fig. 2, the refractive index of the hydrogel containing lithium bromide is higher, and all rises with the raising of concentration.
Embodiment 1
The lithium bromide (refractive index 1.4316) for preparing the 50wt% of 7mL, (is purchased from Tai Tan scientific & technical corporation, article No. is
01112263) it mixes with the acrylamide of 3g (being purchased from Sigma Corporation, article No. V900845), then is added into solution
The photoinitiator 2,2'- azo-bis-isobutyrate hydrochloride (being purchased from Sigma Corporation, article No. 440914) and 0.012g of 0.0045g
Crosslinking agent N, N'- methylene-bisacrylamide (being purchased from Sigma Corporation, article No. 146072).Then mixed solution injection is saturating
In bright silica gel capillary (being purchased from Shanghai Shen Hui product of rubber and plastic factory), transparent silica gel capillary/contain is obtained after ultraviolet light solidification 2min
The optical fiber of the polyacrylamide hydrogel (refractive index 1.4221) of lithium bromide.
Embodiment 2
The lithium bromide (refractive index 1.4320) for preparing the 50wt% of 7mL is mixed with the acrylamide of 3g, then into solution
The photoinitiator 2,2'- azo-bis-isobutyrate hydrochloride of 0.0045g and crosslinking agent N, the N'- methylene bisacrylamide of 0.012g is added
Amide.Then in mixed solution injection transparent silica gel capillary, transparent silica gel capillary/contain is obtained after ultraviolet light solidification 2.5min
The optical fiber of the polyacrylamide hydrogel (refractive index 1.4233) of lithium bromide.
Embodiment 3
The lithium bromide (refractive index 1.4310) for preparing the 50wt% of 7mL is mixed with the acrylamide of 3g, then into solution
The photoinitiator 2,2'- azo-bis-isobutyrate hydrochloride of 0.0045g and crosslinking agent N, the N'- methylene bisacrylamide of 0.012g is added
Amide.Then in mixed solution injection transparent silica gel capillary, transparent silica gel capillary/brominated is obtained after ultraviolet light solidification 3min
Change the optical fiber of the polyacrylamide hydrogel (refractive index 1.4229) of lithium.
Embodiment 4
The lithium bromide (refractive index 1.4733) for preparing the 60wt% of 7mL is mixed with the acrylamide of 3g, then into solution
The photoinitiator 2,2'- azo-bis-isobutyrate hydrochloride of 0.0045g and crosslinking agent N, the N'- methylene bisacrylamide of 0.012g is added
Amide.Then in mixed solution injection transparent silica gel capillary, transparent silica gel capillary/contain is obtained after ultraviolet light solidification 2.5min
The optical fiber of the polyacrylamide hydrogel (refractive index 1.4427) of lithium bromide.
Embodiment 5
The lithium bromide (refractive index 1.4723) for preparing the 60wt% of 6.5mL is mixed with the acrylamide of 3.5g, then Xiang Rong
The photoinitiator 2,2'- azo-bis-isobutyrate hydrochloride of 0.0053g and crosslinking agent N, the N'- di-2-ethylhexylphosphine oxide of 0.014g are added in liquid
Acrylamide.Then in mixed solution injection transparent silica gel capillary, transparent silica gel capillary is obtained after ultraviolet light solidification 2.5min
The optical fiber of the pipe/polyacrylamide hydrogel (refractive index 1.4520) containing lithium bromide.Firstly, steady to the propagation of material light
It is qualitative to be detected, as shown in figure 5, the light propagation of material changes very little in the case where not interfered by extraneous factor.Then, to system
Standby material carries out pressing while recording optical signal data, as shown in fig. 6, (using UTM2103 by pressure regular
Type microcomputer controlled electronic universal tester), regular variation is also presented in optical attenuation.As shown in figure 3, luminous intensity with propagate away from
From increase and reduce, and the amount of reduction is changed linearly with length.It is fine to the single polyacrylamide hydrogel containing lithium bromide
Dimension carries out mechanical test, as shown in figure 4, the hydrogel draftability containing lithium bromide is good.
Embodiment 6
The lithium bromide (refractive index 1.4731) for preparing the 60wt% of 6mL is mixed with the acrylamide of 4g, then into solution
The photoinitiator 2,2'- azo-bis-isobutyrate hydrochloride of 0.006g and crosslinking agent N, the N'- methylene bisacrylamide of 0.016g is added
Amide.Then in mixed solution injection transparent silica gel capillary, transparent silica gel capillary/contain is obtained after ultraviolet light solidification 2.5min
The optical fiber of the polyacrylamide hydrogel (refractive index 1.4649) of lithium bromide.
Claims (9)
1. a kind of hydrogel optical fiber, which is characterized in that the optical fiber is skin-core structure, and wherein cortex is transparent silica gel
Capillary；Sandwich layer is the polyacrylamide hydrogel containing lithium bromide.
2. a kind of preparation method of hydrogel optical fiber, comprising:
(1) lithium bromide water solution is mixed with acrylamide monomer, obtains mixed solution；
(2) in mixed solution be added photoinitiator, crosslinking agent, be then injected into transparent silica gel capillary, ultraviolet light solidification to get
Hydrogel optical fiber.
3. preparation method according to claim 2, which is characterized in that the quality hundred of lithium bromide water solution in the step (1)
Dividing concentration is 50wt%-60wt%；The mass percentage concentration of acrylamide monomer is 30-40wt% in mixed solution.
4. preparation method according to claim 2, which is characterized in that mixed solution in the step (1) specifically: acryloyl
Amine monomers are added in lithium bromide water solution, and then ultrasound removes bubble for oscillation dissolution.
5. preparation method according to claim 2, which is characterized in that photoinitiator is 2,2'- azo two in the step (2)
NSC 18620 hydrochloride；Crosslinking agent is N, N'- methylene-bisacrylamide.
6. preparation method according to claim 2, which is characterized in that photoinitiator, crosslinking agent and propylene in the step (2)
The mass ratio (0.0014-0.0016) of amide monomer: (0.0035-0.0045): 1.
7. preparation method according to claim 2, which is characterized in that the outer diameter of transparent silica gel capillary in the step (2)
For 1.5mm, internal diameter 1.0mm.
8. preparation method according to claim 2, which is characterized in that UV light turns in the step (2): ultraviolet light
Wavelength is 365nm and light application time was at 2-3 minutes.
9. the application of hydrogel optical fiber described in a kind of claim 1.
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| CN110541209A (en) * | 2019-09-19 | 2019-12-06 | 东华大学 | Continuous preparation method of hydrogel optical fiber based on reactive spinning |
| CN110609371A (en) * | 2019-08-23 | 2019-12-24 | 厉高成 | Anti-drawing optical fiber, manufacturing method thereof and signal transmission system |
| CN110923838A (en) * | 2019-11-05 | 2020-03-27 | 东华大学 | High-light-guiding and high-moisture-retention nano composite hydrogel optical fiber and preparation method thereof |
| CN110938221A (en) * | 2019-11-08 | 2020-03-31 | 北京科技大学 | Method for preparing power-electricity conversion interface molecular composite material film friction electronic device |
| CN111501122A (en) * | 2020-05-08 | 2020-08-07 | 广东工业大学 | Luminescent hydrogel fiber and preparation method and application thereof |
| CN111685755A (en) * | 2020-05-29 | 2020-09-22 | 华南理工大学 | AgNWs-PDMS composite flexible conductive optical fiber micro-lens and preparation method thereof |
| CN113598754A (en) * | 2021-07-16 | 2021-11-05 | 南方科技大学 | Wearable device, and human body motion detection method and device |
| CN114163676A (en) * | 2021-12-27 | 2022-03-11 | 华侨大学 | Liquid core hydrogel optical fiber, preparation method and application thereof, liquid core hydrogel optical fiber probe sensor and application thereof |
| CN116254620A (en) * | 2023-03-30 | 2023-06-13 | 西南大学 | Organic gel optical fiber and preparation method thereof |
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| CN110609371A (en) * | 2019-08-23 | 2019-12-24 | 厉高成 | Anti-drawing optical fiber, manufacturing method thereof and signal transmission system |
| CN110541209A (en) * | 2019-09-19 | 2019-12-06 | 东华大学 | Continuous preparation method of hydrogel optical fiber based on reactive spinning |
| CN110541209B (en) * | 2019-09-19 | 2021-08-10 | 东华大学 | Continuous preparation method of hydrogel optical fiber based on reactive spinning |
| CN110923838A (en) * | 2019-11-05 | 2020-03-27 | 东华大学 | High-light-guiding and high-moisture-retention nano composite hydrogel optical fiber and preparation method thereof |
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| CN110938221A (en) * | 2019-11-08 | 2020-03-31 | 北京科技大学 | Method for preparing power-electricity conversion interface molecular composite material film friction electronic device |
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| CN111685755A (en) * | 2020-05-29 | 2020-09-22 | 华南理工大学 | AgNWs-PDMS composite flexible conductive optical fiber micro-lens and preparation method thereof |
| CN111685755B (en) * | 2020-05-29 | 2021-09-21 | 华南理工大学 | AgNWs-PDMS composite flexible conductive optical fiber micro-lens and preparation method thereof |
| CN113598754A (en) * | 2021-07-16 | 2021-11-05 | 南方科技大学 | Wearable device, and human body motion detection method and device |
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| CN114163676B (en) * | 2021-12-27 | 2022-12-16 | 华侨大学 | Liquid core hydrogel optical fiber, preparation method and application thereof, liquid core hydrogel optical fiber probe sensor and application thereof |
| CN116254620A (en) * | 2023-03-30 | 2023-06-13 | 西南大学 | Organic gel optical fiber and preparation method thereof |
| CN116254620B (en) * | 2023-03-30 | 2024-09-06 | 西南大学 | Organic gel optical fiber and preparation method thereof |
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